/* =========================================================
   Home page — "the value of hands-on courses"
   Layered on assets/css/style.css. All classes start with hv-.
   ========================================================= */

/* Headings that live outside .section-head */
.hv-sim-copy h2, .hv-stack-wrap h2, .hv-now h2, .hv-cost h2 {
  margin: 18px 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 3.3vw, 40px);
  line-height: 1.12;
  letter-spacing: -.035em;
  color: var(--ink);
}
.hv-sim-copy .lead, .hv-stack-wrap .lead, .hv-now .lead { margin-inline: 0; }

/* ---------- hero ---------- */
.hv-hero { padding-bottom: 88px; }
.hv-stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  max-width: 980px;
  margin: 56px auto 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.hv-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 16px 20px;
  background: rgba(255, 255, 255, .94);
  text-align: center;
}
.hv-stats b {
  font-family: var(--font-display);
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hv-stats span:not([data-count]) { font-size: 12.5px; line-height: 1.4; color: var(--muted); }

/* ---------- passive vs active ---------- */
.hv-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 980px;
  margin: 0 auto;
}
.hv-col {
  padding: 26px 26px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--white);
}
.hv-col h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--ink);
}
.hv-col h3 .ic {
  width: 30px; height: 30px; padding: 6px;
  border-radius: 9px;
}
.hv-col ul { display: grid; gap: 11px; margin-top: 18px; }
.hv-col li { position: relative; padding-left: 20px; font-size: 15px; line-height: 1.5; }
.hv-col li::before {
  content: '';
  position: absolute; left: 2px; top: .62em;
  width: 7px; height: 7px; border-radius: 50%;
}
.hv-col-passive { background: #fbfcfd; }
.hv-col-passive h3 .ic { color: #b91c1c; background: #fef2f2; }
.hv-col-passive li { color: var(--faint); }
.hv-col-passive li::before { background: #cbd5e1; }
.hv-col-active {
  border-color: rgba(6, 182, 212, .35);
  background: linear-gradient(160deg, #ffffff 40%, #ecfeff 100%);
  box-shadow: var(--shadow-md);
}
.hv-col-active h3 .ic { color: var(--emerald-600); background: var(--emerald-50); }
.hv-col-active li { color: var(--ink-2); font-weight: 500; }
.hv-col-active li::before { background: var(--grad); }

.hv-evidence { max-width: 980px; margin: 22px auto 0; }
.hv-proof { padding: 26px 26px 22px; }
.hv-proof-num {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1;
  color: var(--cyan-700);
}
.hv-proof h3 { margin-top: 12px; font-family: var(--font-display); font-size: 18px; color: var(--ink); line-height: 1.3; }
.hv-proof p { margin-top: 10px; font-size: 14.5px; line-height: 1.6; }
.hv-proof b { color: var(--ink-2); }
.hv-cite {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 14px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--cyan-700);
}
.hv-cite:hover { text-decoration: underline; }

/* ---------- retention simulator ---------- */
.hv-sim-wrap {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 48px;
  align-items: center;
}
.hv-toggles { display: grid; gap: 9px; margin-top: 26px; }
.hv-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--white);
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.hv-toggle:hover { border-color: rgba(6, 182, 212, .4); }
.hv-toggle input { width: 18px; height: 18px; accent-color: var(--cyan-600); flex: none; }
.hv-toggle span { display: flex; flex: 1; justify-content: space-between; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.hv-toggle b { font-size: 14.5px; font-weight: 600; color: var(--ink-2); }
.hv-toggle i { font-style: normal; font-size: 12px; color: var(--faint); }
.hv-toggle.is-fixed { cursor: default; background: #f8fafc; }
.hv-toggle:has(input:checked):not(.is-fixed) { border-color: rgba(6, 182, 212, .45); background: #f0fdfa; }

.hv-sim { padding: 22px 22px 18px; }
.hv-sim:hover { transform: none; }
.hv-sim-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.hv-kicker { font-size: 10.5px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); }
.hv-sim-head h3 { margin-top: 4px; font-family: var(--font-display); font-size: 18px; color: var(--ink); }
.hv-chip {
  flex: none;
  padding: 6px 11px;
  border-radius: 999px;
  background: var(--emerald-50);
  color: var(--emerald-600);
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
}
#simCanvas { width: 100%; height: auto; aspect-ratio: 560 / 300; margin-top: 14px; display: block; }
.hv-sim-foot {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}
.hv-k { display: block; font-size: 11.5px; color: var(--faint); }
.hv-sim-foot b, .hv-path-meta b { font-family: var(--font-display); font-size: 20px; color: var(--ink); letter-spacing: -.02em; }
.hv-note { margin-top: 12px; font-size: 12px; line-height: 1.55; color: var(--faint); }

/* ---------- learning loop ---------- */
.hv-loop {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  padding: 0;
  list-style: none;
  counter-reset: none;
}
.hv-loop li {
  position: relative;
  padding: 22px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}
.hv-loop li:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 42px; right: -12px;
  width: 10px; height: 10px;
  border-top: 2px solid #94a3b8;
  border-right: 2px solid #94a3b8;
  transform: rotate(45deg);
  z-index: 1;
}
.hv-step {
  position: absolute;
  top: 16px; right: 16px;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  color: var(--line);
  line-height: 1;
}
.hv-loop h3 { margin-top: 14px; font-family: var(--font-display); font-size: 17px; color: var(--ink); }
.hv-loop p { margin-top: 8px; font-size: 13.8px; line-height: 1.55; }

/* ---------- outcomes ---------- */
.hv-outcome { display: flex; flex-direction: column; padding: 26px 24px 22px; }
.hv-outcome h3 { margin-top: 16px; font-family: var(--font-display); font-size: 18.5px; color: var(--ink); line-height: 1.3; }
.hv-checks { display: grid; gap: 10px; margin-top: 16px; flex: 1; }
.hv-checks li { position: relative; padding-left: 24px; font-size: 14.2px; line-height: 1.5; color: var(--ink-2); }
.hv-checks li::before {
  content: '';
  position: absolute; left: 0; top: .3em;
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--emerald-50) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23059669' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5 12.5 4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / 10px no-repeat;
}
.hv-checks code { font-size: 12.5px; padding: 1px 5px; border-radius: 5px; background: #f1f5f9; }
.hv-roles {
  display: flex; align-items: flex-start; gap: 8px;
  margin-top: 18px; padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.8px; line-height: 1.45; color: var(--muted);
}
.hv-roles .ic { margin-top: 2px; color: var(--cyan-600); }

/* ---------- stack ---------- */
.hv-stack-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.hv-small { margin-top: 16px; font-size: 14px; line-height: 1.6; color: var(--muted); }
.hv-small a, .hv-who a { color: var(--cyan-700); font-weight: 600; }
.hv-small a:hover, .hv-who a:hover { text-decoration: underline; }
.hv-stack { display: grid; gap: 12px; perspective: 900px; }
.hv-layer {
  display: grid;
  grid-template-columns: 110px 1fr;
  grid-template-rows: auto auto;
  column-gap: 16px;
  align-items: center;
  padding: 20px 22px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: transform .3s ease;
}
.hv-layer:hover { transform: translateX(6px); }
.hv-layer-k {
  grid-row: span 2;
  font-size: 10.5px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
}
.hv-layer b { font-family: var(--font-display); font-size: 17px; color: var(--ink); }
.hv-layer > span:last-child { font-size: 13.5px; color: var(--muted); }
.hv-layer-ai { border-left: 4px solid var(--cyan); margin-right: 0; }
.hv-layer-ai .hv-layer-k { color: var(--cyan-700); }
.hv-layer-cpp { border-left: 4px solid var(--emerald); margin-left: 18px; }
.hv-layer-cpp .hv-layer-k { color: var(--emerald-600); }
.hv-layer-sec { border-left: 4px solid var(--amber); margin-left: 36px; }
.hv-layer-sec .hv-layer-k { color: #b45309; }

/* ---------- why now ---------- */
.hv-now { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: center; }
.hv-now-figs { display: grid; gap: 12px; }
.hv-now-figs div {
  display: flex; align-items: center; gap: 20px;
  padding: 18px 22px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--bg);
}
.hv-now-figs b {
  flex: none; min-width: 104px;
  font-family: var(--font-display); font-size: 32px; font-weight: 800; letter-spacing: -.04em;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hv-now-figs span { font-size: 14.5px; line-height: 1.5; color: var(--ink-2); }

/* ---------- path builder ---------- */
.hv-path { padding: 22px; }
.hv-path:hover { transform: none; }
.hv-goals { display: flex; flex-wrap: wrap; gap: 8px; padding-bottom: 18px; border-bottom: 1px solid var(--line-soft); }
.hv-goal {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--white);
  font-size: 13.5px; font-weight: 600; color: var(--ink-2);
  transition: all .2s;
}
.hv-goal:hover { border-color: rgba(6, 182, 212, .45); }
.hv-goal.is-on { background: var(--ink); border-color: var(--ink); color: #fff; }
.hv-goal .ic { font-size: 15px; }
.hv-path-body { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 32px; padding-top: 22px; }
.hv-path-info h3 { font-family: var(--font-display); font-size: 22px; color: var(--ink); letter-spacing: -.02em; }
.hv-path-info p { margin-top: 10px; font-size: 14.8px; line-height: 1.6; }
.hv-path-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 22px; }
.hv-path-meta > div { padding: 12px 14px; border-radius: 12px; background: var(--bg); border: 1px solid var(--line-soft); }
.hv-path-list { display: grid; gap: 6px; padding: 0; list-style: none; counter-reset: hvp; }
.hv-path-list li { counter-increment: hvp; }
.hv-path-list a {
  display: grid;
  grid-template-columns: 26px auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 11px;
  border: 1px solid transparent;
  transition: background .2s, border-color .2s;
}
.hv-path-list a:hover { background: var(--bg); border-color: var(--line); }
.hv-path-list a::before {
  content: counter(hvp);
  width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--cyan-50); color: var(--cyan-700);
  font-size: 11.5px; font-weight: 700;
}
.hv-tag {
  padding: 3px 8px; border-radius: 6px;
  font-size: 10.5px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; white-space: nowrap;
}
.hv-tag-rob { background: var(--cyan-50); color: var(--cyan-700); }
.hv-tag-cpp { background: var(--emerald-50); color: var(--emerald-600); }
.hv-tag-sec { background: var(--amber-50); color: #b45309; }
.hv-path-t { font-size: 14px; font-weight: 500; color: var(--ink-2); line-height: 1.35; }
.hv-path-m { font-size: 12px; color: var(--faint); white-space: nowrap; }

/* ---------- who ---------- */
.hv-who { padding: 22px 20px; }
.hv-who h3 { margin-top: 14px; font-family: var(--font-display); font-size: 17px; color: var(--ink); }
.hv-who p { margin-top: 8px; font-size: 14px; line-height: 1.55; }

/* ---------- cost ---------- */
.hv-cost {
  display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 40px; align-items: center;
  padding: 34px 36px;
  border-radius: var(--radius);
  background: var(--grad-soft);
  border: 1px solid #cdeff3;
}
.hv-cost h2 { margin-bottom: 0; }
.hv-cost-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 24px; }
.hv-cost-list li { display: grid; grid-template-columns: 22px 1fr; column-gap: 10px; align-items: start; }
.hv-cost-list .ic { grid-row: span 2; font-size: 20px; margin-top: 2px; color: var(--cyan-700); }
.hv-cost-list b { font-size: 15px; color: var(--ink); }
.hv-cost-list span { font-size: 13.5px; line-height: 1.45; color: var(--body); }

/* ---------- courses ---------- */
.hv-course { display: flex; flex-direction: column; padding: 26px 24px 22px; }
.hv-course h3 { margin-top: 16px; font-family: var(--font-display); font-size: 19px; color: var(--ink); line-height: 1.3; }
.hv-course p { margin-top: 10px; font-size: 14.5px; line-height: 1.55; flex: 1; }
.hv-course-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.hv-course-meta li {
  padding: 4px 9px; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--line-soft);
  font-size: 12px; font-weight: 600; color: var(--muted);
}
.hv-go { display: inline-flex; align-items: center; gap: 7px; margin-top: 18px; font-size: 14px; font-weight: 700; color: var(--cyan-700); }
.hv-course:hover .hv-go .ic { transform: translateX(3px); }
.hv-go .ic { transition: transform .2s; }
.faq-a a { color: var(--cyan-700); font-weight: 600; }

/* ---------- responsive ---------- */
@media (max-width: 1023px) {
  .hv-loop { grid-template-columns: repeat(3, 1fr); }
  .hv-loop li::after { display: none; }
  .hv-sim-wrap, .hv-stack-wrap, .hv-now { grid-template-columns: 1fr; gap: 32px; }
  .hv-path-body { grid-template-columns: 1fr; }
  .hv-cost { grid-template-columns: 1fr; gap: 22px; }
}
@media (max-width: 760px) {
  .hv-stats { grid-template-columns: repeat(2, 1fr); }
  .hv-stats li:last-child { grid-column: span 2; }
  .hv-compare { grid-template-columns: 1fr; }
  .hv-loop { grid-template-columns: 1fr 1fr; }
  .hv-cost-list { grid-template-columns: 1fr; }
  .hv-cost { padding: 26px 22px; }
  .hv-layer-cpp, .hv-layer-sec { margin-left: 0; }
  .hv-layer { grid-template-columns: 1fr; row-gap: 4px; }
  .hv-layer-k { grid-row: auto; }
}
@media (max-width: 520px) {
  .hv-loop { grid-template-columns: 1fr; }
  .hv-sim-foot, .hv-path-meta { grid-template-columns: 1fr 1fr 1fr; gap: 6px; }
  .hv-sim-foot b, .hv-path-meta b { font-size: 17px; }
  .hv-path-list a { grid-template-columns: 24px 1fr auto; }
  .hv-path-list .hv-tag { display: none; }
  .hv-now-figs div { flex-direction: column; align-items: flex-start; gap: 6px; }
  .hv-path { padding: 16px; }
}